2007 XC90 confusion

[Finnicky07XC90]

My brother's XC90 croaked the other day, leaving him stranded on the side of the road 30 miles from town. He towed it back home and I drove down to help him fix it.

Ran the codes, and every single ignition coil code came up as well as a "cylinder 4 misfire". P0351-P0356 and P0304.

Opened the engine to replace the ignition coils, only to notice one seems to have ruptured (photo attached). The plastic housing at the top of the coil split and leaked some black substance. Pulled that one, put a new coil in, tried to start it up. No luck, but now I'm noticing his battery is getting old and doesn't seem healthy. I replace that and it cranks over much better but still won't start.

Anybody else have a similar issue? I was thinking I'd try out a PCM swap next, but if anyone has any better ideas I'd be grateful. Cheers.

[volvolugnut]

These Volvo's need sufficient battery voltage to drive all the electronics before they will start. Cranking speed is not a good indicator of battery condition. Can you test battery voltage at the battery terminals with and without cranking?
Voltage without cranking should be near 14.2 or more volts. Cranking voltage should not drop much.
If the battery does not produce this voltage, charge the battery until it reaches these values and try again to start.
volvolugnut

[pgill]

Here is the theory.

1. The Thermostat Fails (this is know to happen after 10 years or 100,000 miles)

2. The Engine then operates at an undesirably high temperature and the ignition coil can't take the heat and it fails.



Links with more information

https://www.freel2.com/forum/topic32245.html

http://www.volvoxc.com/forums/showthread.p...-2009-XC70

v...mp;t=86205

1. Replace the Thermostat

2. Replace the coil packs

Check the voltage drop from the coil grounds to the battery (-)
viewtopic.php?t=98362

3. Replace the sparkplugs Denso 4704 IKH20TT Iridium TT

If you like your parts in a Volvo box then get 31286359 (These are Denso Iridium TT Plugs)

The 3.2 is an amazing engine but it needs proactive maintenance.

Thanks

Paul

2008 LR2 3.2 130,000 (Original Coil Packs, Thermostat replaced at 10 years of age)
2010 S80 3.2 150,000 (Original Coil Packs, Thermostat replaced at 9 years of age)

The 3.2 was used by Volvo and LAND ROVER as part of the FORD Premier Automotive Group back in the day.

[pgill]

When the coil fails it tends to break a fuse.

I think all six coils share the same fuse (I can't remember)

I have no idea where this fuse is on an XC90.

Good luck

Paul